I also wanted to make it as it called for frozen raspberries, they are often cheaper than fresh.
I made the recipe just as called for. Do use bottled lemon juice not fresh lemon juice. Lemons vary in acidity and jams need the acid level to be consistent.
So good! Sue had baked fresh bread and gave us some to eat with the jam. We tried it with ice cream also and I loved it. I am going to make more before the plums are done. The consistency was perfect and it has a lovely color and is not overly sweet. All in all, one of the best jams I have made in a long time.
I made just half of the recipe and put it in ½ pint jars. We like that size as it gets eaten up faster in a small family.
See our canning tips for some tips on hot water bath canning.
Raspberry Plum Jam
4 ½ cups chopped or coarsely ground peeled, pitted fresh plums (I used red plums for the color)
2 packages (10 ounces each) frozen sweetened raspberries
10 cups sugar
½ cup bottled lemon juice
2 pouches (3 ounces each) liquid fruit pectin
In a heavy kettle, combine the plums, raspberries, sugar and lemon juice. Bring to a full rolling boil stirring constantly. Quickly stir in pectin; return to a full rolling boil. Boil for one minute. Skim off foam. Carefully ladle into hot pint jars leaving ¼ inch head space. Remove air bubbles, wipe rims adjust hot lids and rings. Process for 10 minutes in a boiling water canner.